Container for electrolytic condensers



June 11, 1940. GEORGIEV 2,203,902

CONTAINER FOR ELECTROLYTIC CONDENSERS Original Filed June 23,: 1934 INVENTOR filexdnderM Eemyzev ATTORNEYS Patented June 11, 1940 PATENT OFFICE CONTAINER FOR ELECTROLYTIC CONDENSERS Alexander M. Georgiev, Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich,

a corporation of Delaware Original application June 23, 1934, Serial No.

132,119. Divided and this application Novem-' bet-26, 1937, Serial No. 176,479

' Claims. (01. ma-s9) This invention relates generally to electrolytic condensers and .,-more particularly to containers for dry or substantially dry electrolytic condensers being a division of S. N. 732,119, filed June 23,1934, now ..s. Patent No. 2,125,373.

It is an object of the present invention to provide a container ,of good heat dissipating material for electrolytic condensers particularly of the dry or substantially dry type, in which an appreciable amount of heat is generated due to the flow of currents'of considerable magnitude.

It is another object of the present invention to seal the containers in a manner that the seal is not affected by a heat treatment to which the condenser may be subjected subsequently.

It is another object of the present invention to provide an improved vent plug in sealed containers of electrolytic condensers.

Further objects and advantages of the present invention will be" apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 is a perspective view of a condenser embodying the present invention.

Fig. 2 is a cross-section through the condenser.

Fig. 3 is a top view of the cover.

Fig. 4 is an enlarged fragmentary section taken on the line 4--4 of Fig. 3.

Fig. 5 illustrates a modification of the disclosure in Fig. 4.

Referring to the drawing, there is shown an electrolytic condenser I 0 of the dry or substantially dry type. This condenser comprises an open container l2 within which is located a form wound and subsequently flattened conventional condenser section l4. The open container is closed by a cover IS. The container I0 is made 40 of any suitable metal having good heat dissipating properties such as tinned steel, and consists of side walls l8 which are formed from one piece and the ends thereof sealed together by soldering or otherwise, and a bottom 20 which is secured 45 to the side walls [8 by preferably soldering the drawn rim 22 of the bottom to the side walls 18. The cover it is molded preferably from Bakelite or hard rubber and has a metal rim insert 24 preferably of the same material as the container 50 I8. As best shown in Fig. 2, the rim 24 of the cover i6 overlaps the side walls ill of the container and is soldered thereto in order to form a perfect seal. Also molded in the cover iii are a plurality of terminals 26 all of which extend 55 to the outside of the sealed container and two of which extend to the inside of the container and are connected in any suitable manner with the electrodes ,28of'the condenser section l4. The

other terminals serve for the connection of an electric motor with a power source in case where the condenser is used in connection with the electric motor and is directly mounted thereon.

Due to the flow of currents of considerable magnitude in the condenser, an appreciable amount of heat is generated which naturally is accompanied by a corresponding expansion of the air and vapors within the sealed container. In case the condenser becomes excessively overheated, the following provision is made for permitting the escape of the highly compressed air and vapors from the sealed container. As best shown in Fig. 4, the cover It is provided with an opening 30 of two different diameters and an internal shoulder 32. Resting on the shoulder 32 and extending across the opening 30 is a diaphragm 34 of flexible or better resilient material such as rubber, and press fitted or otherwise secured in said opening 30 is a washer 36 which clamps the diaphragm 34 against the internal shoulder 32. In case the air and vapors in the sealed container 12 become too hot and therefore excessively compressed, the unclamped portion of the diaphragm will become ruptured and the air and vapors may then escape therethrough.

is provided with a similar opening 40 of two dif- .cover and directly above the opening 40 thereof.

An eyelet 48 is then pressed into the opening whereby the disc 44 is pressed against the side walls 50 and the internal shoulder 42 thereof, whereby a central portion 52 of the disc is slightly stretched. Again when the air and vapors in the sealed container become too highly compressed under excessive heat generation of the condenser the stretched diaphragm portion 52 will become ruptured and permit the compressed air and vapors to escape from the container.

The diaphragms 34 and. 52 naturally permit a limited expansion of the air in the sealed container as for instance during the reforming of the condenser, due to the ability of a portion of either diaphragm to stretch within the elastic limits of the diaphragm material.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form,

it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow What is claimed is as follows:

1. In a cover for a container of an electrolytic condenser and having a counterborecl hole providing an annular shoulder, a resilient impervious diaphragm within and extending across the hole; and an eyelet of Z-shaped cross section press-fitted into both bores of the counterbore and clamping the diaphragm against the annular shoulder and the wall of the counterbore.

2. In a cover for a container of an electrolytic condenser and having a counterbored hole, a resilient diaphragm of impervious material within and extending across the hole; and an eyelet press-fitted in the counterbore, said eyelet clamping the diaphragm against the annular shoulder of the counterbore and stretching a central portion of the diaphragm.

In a cover for a container of an electrolytic condenser and having a counterbored hole providing an annular shoulder, a resilient diaphragm within and extending across the aperture; and an eyelet of Z-shaped cross section in the hole,

said eyelet clamping the diaphragm against the annular shoulder and the walls of the hole and stretching a central portion of the diaphragm.

4. An electrolytic condenser including a closed section holding container, means providing an opening into the container, a diaphragm of resilient and leak-proof impervious material stretched over the opening in the container to seal the same, and means for securing the diaphragm in the opening in a stretched condition, the strength of the diaphragm being such that it will burst under a pressure developed by excessively compressed vapors within the container.

5. An electrolytic condenser including a closed section holding container, means providing an opening through the container wall, a diaphragm of resilient rubber stretched over the opening to seal the same, and means press-fitted into the opening holding the diaphragm in place. the strength of the diaphragm being such that it will burst when the vapors within the container are excessively compressed.

ALEXANDER. M. GEORGIEV. 

